Question

Asked Oct 13, 2019

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A parachutist wants to design a parachute, such that a person weighing 150 lbs(667N) descends at a rate of 5.00 mph(2.23 m/s). To calculate the drag coefficient in kg/m, is the way to conceptualize the solution:

1. At terminal velocity the drag force equals the force of gravity. Since the net forces are zero, there is no acceleration and the velocity is constant.

2. The drag constant *b* is not 1. It comes from the terminal velocity equation:

V_term = square root(*mg*/*b*)

If you know the weight *mg* and the terminal velocity, then you can solve for *b*.

Please help me to derive the solution by helping me to understand better. I understand point 1. But I don't understand clearly point 2?

Step 1

The given equation for the terminal velocity is

Step 2

Squaring the equation (1...

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